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  • 2000-2004  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    General solution for the thermal wave scattering in fiber composites (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 1087-1098 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article we present a general solution for the ac temperature field generated from a modulated heating in an opaque material containing a series of aligned subsurface cylinders. The model includes the multiple scattering effects suffered by the plane thermal wave, generated by a planar heat source, when interacting with the cylinders and with the sample surfaces. A series solution to the heat diffusion equation and a matrix formulation to solve the scattering coefficients are used. There are no restrictions on the cylinders number, on their size and position inside the material, nor on the thermal properties of cylinders and sample. For completeness the case of coated cylinders is also investigated. Numerical calculations for the case of nonconducting cylinders illustrate the effect of the multiple scattering of the incident thermal wave on the sample surface temperature. A specific case of interest of the model is its application to the thermal characterization and nondestructive evaluation of fiber reinforced composites. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1421633
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Multiple scattering effects of thermal waves by two subsurface cylinders (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 2600-2607 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a theoretical model and experimental measurements of the temperature field produced by the multiple scattering of thermal waves between two close subsurface cylinders and the material surface. The thermal waves are excited at the surface of an opaque material by an extended modulated optical beam. The cylinders are taken as thermal insulating holes and the model is run for a variety of modulation frequencies, thermal properties of the sample, and geometric properties of the cylinders (sizes, depths, mutual separation). The photothermal signal obtained using an infrared radiometry technique on calibrated samples validate our model predictions. The model is used to address the question of the spatial resolving power in photothermal wave experiments and introduce a novel resolution criterion. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372225
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  • 3
    Electronic Resource
    Electronic Resource
    Multiple scattering of thermal waves by a coated subsurface cylindrical inclusion (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5696-5702 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article we present a theoretical and experimental study of the multiple scattering of a plane thermal wave between a two-layer subsurface cylinder and the material surface. The thermal wave is generated at the surface of an opaque material by a modulated extended laser beam. First we study the multiple scattering of the thermal wave produced by a single conducting cylinder with arbitrary thermal properties. Then, we present a model of the multiple scattering of the wave produced by the two-layer cylinder and the surface. We calculate the surface temperature for two extreme cases of layering: (i) a coating air layer and (ii) a highly conducting coating. Measurements performed with an infrared radiometry photothermal technique on a calibrated set of samples are presented. They validate our models for the homogeneous layered cylindrical conductors. It is demonstrated that the most direct application of this study is the quantitative analysis of the thermal contact resistance (or the characteristics of a coating layer) in a fiber reinforced composite. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1365442
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  • 4
    Electronic Resource
    Electronic Resource
    On the effective thermal diffusivity of fiber-reinforced composites (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1903-1905 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Modulated photothermal techniques provide useful methods based on linear relations between measurable quantities to obtain the thermal diffusivity of homogeneous materials. In this letter the applicability of such linear relations in the case of unidirectional fiber-reinforced composites (UFRC) is analyzed. Based on the solution of the propagation of plane thermal waves in a material with aligned buried cylinders, we found that the linear relation valid for homogeneous materials still holds for UFRC. However, its slope does not give the effective thermal diffusivity as derived from the effective thermal conductivity measured by steady-state experiments. Anyway, as the number of cylinder rows increases the thermal diffusivity measured by modulated methods approaches the steady value asymptotically. The model is validated by photothermal measurements performed on calibrated samples. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1461422
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  • 5
    Electronic Resource
    Electronic Resource
    On the strong influence of the photoelastic effect in the collinear mirage deflection (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 2665-2667 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report in this letter on the strong influence of the polarization state of the probe beam in the amplitude and phase of the collinear mirage deflection. A model of the collinear mirage deflection that takes into account the photoelastic effect in the sample has been developed. The agreement between the model predictions and the experimental results is excellent. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126437
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  • 6
    Electronic Resource
    Electronic Resource
    A strong decrease in Saturn's equatorial jet at cloud level (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 423 (2003), S. 623-625 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The atmospheres of the giant planets Jupiter and Saturn have a puzzling system of zonal (east–west) winds alternating in latitude, with the broad and intense equatorial jets on Saturn having been observed previously to reach a velocity of about 470 m s-1 at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01653
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    Paper (German National Licenses)
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